Hello, nikie1o2!

This is a bit redundant.I'm given that a square is a quadrilateral that is equilateral and equiangular.

I'm asked to find 3 different characterizations of a square.

I came up with the following biconditionals but dont know if there true both ways.

1.A polygon is a square IFF it is a equilateral rectangle where every angle is a right angle.

"Equilateral rectangle" covers it.

(A rectangle, by defintion, has four right angles.)

An "equilateral parallelogram with four right angles" does cover it.2. Same as above, except a Parallelogram where every etc.

An "equiangular rhombus" covers it.3. Same as above except Rhombus

(A rhombus, by definition, is equilateral.)

I'm not sure that therethree more characteristics.are

"Equilateral" already states that the sides are all equal.

"Equiangular" already states that the angles are all equal.

Are these acceptable?

. . The opposite sides are parallel (also true for a parallelogram).

. . The diagonals are equal (also true for a rectangle).

. . The diagonals are perpendicular (also true for a rhombus).

. . The diagonals bisect each other (also true for a parallelogram).